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Biology 1230 Chapter 6
Define energy
Is the ability to do work
Kinetic energy refers to…
Objects that are in motion
Potential energy is when…
Objects have stored energy but don’t use it
What is chemical energy?
When energy is stored in chemical bonds it’s potential energy, but when released it’s kinetic energy
What is Gibbs Free Energy
(G) = amount of energy available to do work (usable energy)
What does 𝛥G=𝛥H−T𝛥S mean
H means energy
G means free energy
S means entropy
What is entrophy?
When is delta G negative?
When energy is released in a chemical reaction, Products of the reaction will have less free energy than substrates
What does exergonic mean?
Energy is being released
Why are exergonic reactions spontaneous?
They can occur without the addition of energy
When is Delta G positive?
If a chemical reaction requires an input of energy, the product of the reaction will have more free energy than the substrates
What does endergonic mean?
Are non-spontaneous and will not take place unless free energy is added
What is activation energy?
Energy that’s required for a reaction to proceed.
What is the main source for activation energy?
Heat energy which helps reactants reach their transition state
